I updated my Lumia 1320 to Windows 10 Mobile preview, and after that I tried to downgrade back to Windows Phone 8.1 using the Windows Device Recovery tool, but that was unsuccessful.
After that my phone now doesn't turn on (not even showing Nokia logo that shows on boot up). It only vibrates when I connect it to a PC or charger, or when I press and hold power button. What's the problem? Any solutions?